Kylie wears those showgirl outfits since the 90's if I'm not wrong, and once she started presenting herself as a popstar showgirl, they kind of became her thing, but she didn't invent those, so Ayu may not be inspired by her, but both be inspired by the same thing.
On the other hand, Ayu has no shame on copying outfits she likes, so it may be an influence
